Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.0925
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

YELLOW STAIN ON TINPLATE: AN APPROACH BY FTIR SPECTROSCOPY

MANCHA AMARELA EM FOLHA DE FLANDRES: UMA ABORDAGEM POR ESPECTROSCOPIA FTIR

Danglad Flores, José Angel; Mauco, Suyen; Padrón, Carlos; Barrera, Maritza

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Abstract

Tinplate cans affected by tonality changes on their unvarnished bodies as well varnished lids were compared with other ones without defect; characterizing by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Fourier transform infrared spectroscopy (FTIR). The Infrared analysis let identify on defected bodies the absorption bands for Sn-O-Sn bond at 609 and 619 cm–1; while the polymer on top cans with tonality changes showed an absorption reduction at 3000 cm–1 related to OH bonding band; as well the picks related to varnish oxide groups at range of 1700 to 600 cm–1 decreased. The results link the defect with the oxidation of protecting metal and polymer dehydration.

Keywords

Tin oxide, Absorbance total attenuated, Coating.

Resumo

Latas de folha de flandres afetadas pelas alterações de tonalidade em seus corpos não envernizados assim como as suas tampas envernizadas foram comparadas com outras sem defeito; foram caracterizadas por microscopia eletrônica de varredura (MEV), espectroscopia de energia dispersiva de raios-X (EDS) e espectroscopia de infravermelho com transformada de Fourier (FTIR). A análise por infravermelhos permite identificar nos corpos defeituosos as bandas de absorção da ligacao Sn-O-Sn a 609 e 619 cm–1; enquanto que o polímero nas tampas com tonalidade alterada mostrou uma absorção reduzida a 3000 cm–1 relacionada com a banda de ligação OH; assim como os picos relacionados com os grupos de óxido do verniz no intervalo de 1700-600 cm–1 também mostraram diminuição. Os resultados ligam o defeito com a oxidação do metal protector e a desidratação do polímero.

Palavras-chave

Óxido de estanho, Total absorção atenuado, Revestimento.

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